Self-opening die head



SELF OPENING DI HEAD Filed April J, 1921 2 Sheets-Sheet 2 ll l Patented May Z9, 1923..

STATES inane @ATWT ALBERT F. BREITENSTEIN, OF NEVI HAVEN, CONNECTICUT, ASSIGNOR T0 THE GEOMETRIC TOOL CO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

SELF-OPENING DIE HEAD.

Application :ned April 1, 1921.

To all whom t may concern Be it lrnown that 1, ALnnnT FRANK BREIT- ENSTEIN, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Self-Opening Die Heads; and I do hereby declare t-he following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, iii- Fig. 1 a perspective view of a self-opening die-head embodying myl invention.

Fig. 2 a view thereof in front elevation.

Fig. 3 a view thereof in rear elevation.

F ig'. 4 a. view thereof in side elevation on a reduced scale.

F ig. 5 a view thereof in central longitudinal section on the line 5-5 of F ig. 2.

Fig. 6 a view thereof in transverse section on the line 6 6 of Fig. 5.

Fig. 7 a view corresponding to Fig. 5 but showing the device tripped and the chasers in their open or retired positions.

Fig. 8 a detached view in elevation of the tripping-lever.

F ig. 9 a detailed, perspective .'.view show in theengagement of the segment and bolt.

fy invention relates to improved selfopening die-heads primarily designed for use in automatic screw-machines but not so limited, the object being to produce a compact, efficient and reliable tool constructed with special reference to its reduc-tion in length, whereby it is particularly adapted for use in screw-machines wherein its reduction in' length incidentally permits all of the other tools used in the same turret with it to also be reduced in length.

With these ends in view, my invention consists in a self-opening die-head characterized by having the boltereturning spring of its tripping-mechanism mounted independently of the bolt thereof.

My invention further-'consists in a selfopening die-head having a single baclrplate mounting the tripping-mechanism thereof and serving to maintain the camming in position upon the body of the die-head.

My invention further consists in certain `,details of construction and combination of Serial No. 457,801.

parts as will be hereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, it is applied to a self-opening diehead of familiar construction, apart from my invention, which relates in particular to the tripping-mechanis1n, which performs both locking and tripping functions.

The four chasers 10 of the die-head are located in four radial slots 11, arranged quartering with respect to each other in the flat outer face 12 of the die-head body 13, which has a concentric bearing 14 mounting an oscillatory cam-ring 15, from the outer edge of which four eccentric segmental camlugs 16 project and enter transverse slots 17 formed in the inner edges of the respective chasers, whereby the same are radially operated by the oscillation of the ring. The inner edge of the said ring is formed with a rearwardly-opening, annular springchamber 18 which receives a bowed, helical spring 19, employed for automatically turning the ring in the direction of simultaneously opening or retiring the chasers. The said spring is interposed between a pin 20, projecting forwardly into the said chamber from a back-plate 21, and a pin 22, projecting rearwardly into the chamber from the ring, the said back-plate constituting one of the features of my' present invention. Of these two pins,'the pin 20 constitutes the point of purchase from which the spring acts through thepin 22 to rotate the camring in the direction of opening the chasers.

The rotary movement of the ring in the direction of opening, is limited by a stopplunger 23, located in a threaded-bushing 24 mounted in the cam-ring and projecting from the periphery thereof, the said plunger having a stem 25 encircled by a spring 26 located within the bushing and having its outer end threaded for the application of a head 27, by means of which the plunger may be manually retracted. The inner end of the said plunger normally projects into a segmental, peripheral slot 28 formed in the bearing 14 aforesaid, and at one end intersecting an anvil 29 radially mounted in the said bearing and providing an abutment for the pin 23, ,which is brought to a bearing upon the anvil for stopping the rotation of the scam-ring in the direction of opening.

When it is desired to rotate the cam-ring beyond the anvil, for the purpose oli removing the chasers, the plunger 23 is retracted against the Itension oi its spring 26, by means of its head or finger-button 27.

.The said cam-ring is held against rearing-'the cam-ring in place, and of closing the spring-chamber inA the inner 'tace thereof, whereas, heretofore, an intermedia-te plate vhas been employed for holding the cam-ring 1n place and `for closing the yspringi chamber' therein.

ring The saidv plate 2l is formed with a rearwardly-projecting integral hub 3l, embraced by the bowed arms 32 of a tripping- ,"leve'r 33, the said arms being pivotally connectedl with the hub by means of trunnions 34.` Screws 35, passing through the hub 31, Venter the bearing 14 of the body 13 for rigidly s'ecuring the kback-plate thereto. The said lever mounts alocking-member in the form of abolt 36, secured in place by a pin. 37 y and projecting forward into the spring-,chamber 18,A in which it engages with thefoiwvard end 3 8 ol a. segment 39,v located in the chamber and, carryinga forwardlyprojecting studl 40, connected with the cam- 15,' by its interposition between two adjusting-screws '41v mounted therein, whereby, by adjusting them7 position of the .segment withrespect to the .cam-ring is shifted and hence the position in which the ring' is normally vlocked by the bolt 36 againstthe tension of the spring 19.

A .t itsv outerend the tripping-lever33 is 'formed with a hole 43` tor the passage transversely through it ot' a tripping-screw v44, mounting a nut p/and` locking-nut 46, the former-being engagedwith the faceA ot the lever to, tilt thesalne, asin Fig. 7. The said screwis itseli?y pivotally mounted in a slotted-arm, 47, offsetting from an integral circula-r flange. 48, at the 'forward end of .hollow shank 49, bywhich the die-headis mounted inthe`y usual manner in thev turret automatic screw-machine.

.Normally, the nut. 45 is held away from the faceot the trippinglever by the action elia die-head-return, sprlng' 501, interposed betweenthe head otra screw 51 entering.

.v the stem 52 of the body, and the bottom. ot'

asplilashambel 53 inthe @11d 0f, the Shark, thhefs'aidI spring l5K.Orexerting a constant eljl'ort festas the .tesfelfellse 48.01? the. Shank; this. being its cutting position. When, however, at

the die-head bbdilyinward toward` inavao the close ot any given cutting operation, the die-head is pulled outward by the work away fromv the shank against the tension ot the spring 50, the nut 45 is engaged by the 'face of *he tripping-lever 33 andthe same thrown into its inclined position (Fig. 7), in which the locking-bolt 36 is retracted from the spring-chamber 13 in the cam-ring 15 and disengaged from the forward end 38` of the segment 39, thus permitting the cam-spring 19 to act to rotate the camring and thus automatically retire `oropen the chasers 'for the release oi' the wcrnk.A The instant the chasers let gio of the work, .the saidspring 5() asserts itself to return the die-head to its normal position. As the trippingflever 33 rocks toward its lockinghiosition, the end orf the., locking-bolt 36 engages with the rear tace of the segment 39. The cam-ring l5 is nowA turned in the directionof closingthe chasers against the tension of ythe spring 19, by means `or a springlinger 54 secured to its periphery by means' oit a` screw and twoV dowel-pins 56. This movement may be effected either manually or 1n the customary manner by an abutment upon the machine. As the cam-ring turns,-

the segment, carried by it, 'rides' under, so to speak, the end `of the said bolt 36. As soon as the ring reaches the limit oi its rotation in the directionot closing, the bolt is entered into the spring-chamber 13, so as to stand in front of the end 38 of the segment, by means of a locking-bolt-return spring 57 bearing against the inner 'tace ot the back-plate 2l, and encircling a plunger 5,8 loosely mounted in a depending extension 59 of the tripping-lever 3.3l (Fig. 8) and having its headed :torward end'feX- tended into a recess 60 in the bearing .14 of the body 13, the opposite end ofthe said spring being seated against the headed inner end ofthe plunger 58. `At its opposite end, the plunger 58'is provided with a threaded nut 61.r For coupling the diehead, as a unitarystructure,r withthe shank, by means of' which it is mounted in the turret, 'I employ two coupling-'pinsy 62 mounted in thellange 48 of the shankl 49 and extending forward therefrom into holes 63y in the body 13, inthe customary manner.

By mounting the locking-bolt" Areturn spring 57 ot the tripping-lever independently of thelocking-bolt 36, I am'` enabled to reduce the length of the bolt to the .mere requirements of its co-aetioni with the seglment 39 of the cam-ring 15,*whereas, in the self-opening die-heads of the prior art', the locking-bolt has been made suiiiciently. long toserveas a means ftor m'ountingits returnspring, vnecessitating the. employment of amuch -longer die-head body than would otherwise be necessary and so-.resulting in the lengthwise extension of; thewhole diehead structure, andthis, in turn, necessitating the employment of correspondingly long tools to be used in conjunction with it in the turrets of automatic screw machines.

By mounting the locking-bolt return spring independently of the locking-bolt, as upon a plunger, as herein shown and described, l am enabled to reduce the length of the die-head, as a tool, to the minimum, and, incidentally, to use but a single backplate, serving not only for the mounting of the tripping-mechanism but also ior the holding of the cam-ring in place upon the die-head body, whereby I eliminate the intermediate back-plate heretofore employerV for holding the cam-ring in place.

l do not limit myself to the exact construction 'of the self-opening die-head herein shown and described, my invention being characterized by a. self-opening die-head having` the locking-bolt return-spring of its tripping-mechanism made independent of the looking-bolt thereof and further characterized by having its tripping-mechanism mounted upon and carried by a single backplate also serving to hold the cam-ring in place upon the die-head body.

I claim: y

l. A self-openingy die-head having' a body, chasers, a cam-ring, a cam-ring` spring, a back-plate mounted upon the body andfholding the cam-ring in place thereupon, and a pivotal tripping-mechanism carried by the back-plate and including a locking-bolt coacting with the cam ring to hold the same in the closed position of the chasers against the tension of the cam-ring spring.

2. A self-opening die-head having a body, chasers, an oscillating cam-ring for the operation of the chasers, a cam-ring spring, a single back-plate mounted upon the body and holding the cam-ring in place thereupon, and a tripping-mechanism carried by the said back-plate and including' a tripping-lever pivotally-connected therewith and mounting a locking-bolt co-acting With the cam-ring, and also mounting a plunger extending forward into the said body and carrying a spring for returning the locking-bolt into its locked relation to the cam-ring. y

3, A self-opening die-head, having a body, chasers, an oscillating camering for the operation of the chasers, a cam-ring spring for turning the cam in the direction of retiring the chasers, an adjustable segment connected With the cam-ring, a single back-plate mounted upon the said body, holding the cam-ring in place thereupon and confining the cam-spring in place therein; and a tri ping-mechanism carried by the said backplate and including a tripping-lever pivotally mounted thereupon, a lookingbolt carried by the said lever and oo-acting` with the said segment, anda plunger carried by the said lever at a point below the said bolt, eX- tending forward into the said body and mounting a spring operating to re-engage the said bolt With the said segment after the operation of the tripping-mechanism.

ln testimony whereof, I have signed this specification in the presence of two subscribing Witnesses.

ALBERT F. BRETENSTEN.

Witnesses:

EDITH M. BUGKBEE,

1 CHARLES P. CHIPMAN. 

